CMF-250B: The Diamond CMF-250B is a common mode filter designed to effectively reduce unwanted RF currents on coaxial cables in HF and 6 meter installations. In the presence of unbalanced antenna systems, non-optimal feed paths or insufficient RF suppression, common-mode currents can compromise tuning stability, radiation quality and the electromagnetic compatibility of the station environment. The CMF-250B addresses these issues directly by acting on the external conductor of the coaxial cable, where these currents originate. Unlike conventional low-pass filters, which operate predominantly on harmonics, the CMF-250B provides more than 30 dB of common-mode attenuation, reliably reducing stray currents and improving the overall behavior of the antenna system.<\/p>\n
Construction and installation:
\nThe compact and robust construction, with a length of approximately 190 mm and a weight of approximately 300 g, allows for easy integration into any 50 Ohm coaxial line.
\nThe SO-239 connectors ensure immediate compatibility with most existing systems.
\nIt is connected between the radio and the antenna<\/p>\n
The Diamond CMF-250B is particularly indicated when the following occur:
\nRF returns to station
\nInterference on radio, audio or TV equipment
\nInstability in antenna tuning
\nAnomalous behavior of the radiant system<\/p>\n
Specifications:
\nFrequency: 1-54MHz
\nMaximum Power Rating: 250W PEP (1-30 MHz) 200W PEP (30-54 MHz)
\nCommon mode attenuation: More than 30 dB
\nInsertion Loss: Less than 1.2
\nImpedance: 50 Ohms
\nConnector: M-J (SO-239)
\nLength: 190mm (Including connector part)
\nWeight: Approximately 300g<\/p>\n","protected":false},"excerpt":{"rendered":"
CMF-250B: The Diamond CMF-250B is a common mode filter designed to effectively reduce unwanted RF currents on coaxial cables in […]<\/p>\n","protected":false},"featured_media":16153,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[37],"product_tag":[],"class_list":{"0":"post-16080","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-antenna-accessories","8":"first","9":"instock","10":"shipping-taxable","11":"purchasable","12":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/product\/16080","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/comments?post=16080"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/media\/16153"}],"wp:attachment":[{"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/media?parent=16080"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/product_brand?post=16080"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/product_cat?post=16080"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/amateurradiosupplies.com.au\/index.php\/wp-json\/wp\/v2\/product_tag?post=16080"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}